增加 APT 换源前的 https 支持检测#364
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问题描述
修复 #363
创建 Debian/Ubuntu 容器（或某些最小化安装的服务器系统，它们未安装 ca-certificates 所以无法正常访问 https），直接使用
chsrc set <debian/ubuntu> mirrorz换系统源。chsrc 默认是更换 https 源，且脚本并没有判断，只要执行就会换源。一旦换 https 源后 apt 会因为 update 失败而在后续操作中报错。
方案与实现
换源前先判断是否安装了 ca-certificates，如果没安装就直接更换 http 源（同时提醒如何换 https 源）。
判断是否安装 ca-certificates，常规办法是通过 dpkg/apt，但还要截取字符串稍显麻烦。结合现有代码，判断
/usr/share/doc/ca-certificates/copyright等文件是否存在可能更方便。deepin、Kali Linux 等衍生版一般功能较完整，预装 ca-certificates，所以暂时不增加判断逻辑。